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Aug 13, 2015 - RC4 no longer offers adequate security and has been deprecated in PDF 2.0. AES (Advanced Encryption Standard) specified in the standard FIPS-197. AES is a Jan 10, 2010 -Oct 30, 2019 - PDF has been developed with backward compatibility in mind. •. There is a lot of old pdf files you still want to open. •. Can I use 256 AES Encryption (V=5) in 1.7 Jun 16, 2017 - Jan 31, 2019 - Nov 26, 2001 - Dec 23, 2011 - Dec 23, 2011 - The "Encryption Level" setting controls the type of encryption used in the PDF file. The 128 bit AES encryption is compatible with Acrobat Reader 5.0 and above